chapters 2 & 3 energy balances work done by the system, w = - force applied to the system, f Δx...

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Chapters 2 & 3 Energy Balances Work done by the system, W = - Force applied to the system, F Δx or Expansion/Contraction of a Closed System Shaft Work for an Open System Pump leads to a change in pressure at constant volume Force leads to a change in vol at constant pressure 1

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Page 1: Chapters 2 & 3 Energy Balances Work done by the system, W = - Force applied to the system, F Δx or Expansion/Contraction of a Closed System Shaft Work

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Chapters 2 & 3 Energy Balances

Work done by the system, W = - Force applied to the system, F Δx

or

Expansion/Contraction of a Closed System

Shaft Work for an Open System

Pump leads to a change in pressureat constant volume

Force leads to a change in volumeat constant pressure

Page 2: Chapters 2 & 3 Energy Balances Work done by the system, W = - Force applied to the system, F Δx or Expansion/Contraction of a Closed System Shaft Work

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Work Associated with Flow

Lost Work

Viscosity Gradient (Pressure Gradients)Temperature GradientConcentration GradientFriction (of a piston for instance)

Reversible Process

Viscosity Gradient (Pressure Gradients)Temperature GradientConcentration GradientFriction (of a piston for instance)

Page 3: Chapters 2 & 3 Energy Balances Work done by the system, W = - Force applied to the system, F Δx or Expansion/Contraction of a Closed System Shaft Work

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Page 4: Chapters 2 & 3 Energy Balances Work done by the system, W = - Force applied to the system, F Δx or Expansion/Contraction of a Closed System Shaft Work

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Work is a path function not a state function

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Steady-State Open System

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Open System

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Page 14: Chapters 2 & 3 Energy Balances Work done by the system, W = - Force applied to the system, F Δx or Expansion/Contraction of a Closed System Shaft Work

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General Equation for Open System

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CocurrentCountercurrentSuperheater

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10,12,14,15,16,17

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2.2, 2.4

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2.6

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7,8,12,13,15

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16,17,18,21,22

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